EMI problems with DEMO-CR95HF

[per]

Posted on July 01, 2013 at 12:10

Hej!

I just bought a DEMO-CR95HF board to sort out EMI problems that I have with my own design with the CR95HF chip. To my disappointment the DEMO board generates more harmonics than my own design. My measurements can be found at http://milvus.nothagen.se/pub/strfid/rfid.htm Also, when I checked the resonance frequency of the antenna I found that it was tuned to 15.2MHz and not 13.56. The resonance frequency was measured using a spectrum analyser with tracking output. Therefore I wonder: Is DEMO-CR95HF designed for optimal performance? Is there any known optimization can can be done to the board to improve performance? I was planning to use the layout for the circuit between the chip and the antenna. As a consequence of my measurement above I really wonder if you would recommend that? I have also looked at the layout of PLUG-CR95HF-B which is slightly different. Is that layout better? Best Regards Per Nothagen Senior Engineering Manager Triacon AB #cr95hf #emi-filter #demo-cr95hf-a #plug-cr95hf #cr95hf

[Anais GALLIGANI]

Posted on July 15, 2013 at 15:51

Dear customer,

Might you send us your email address please? Thanks a lot, Have a nice day, All the best, NFC/RFID dynamic tag support

[byronl]

Posted on May 30, 2014 at 15:35Hi Nothagen, Did you ever resolve your harmonic issues? I am battling with the same issue and any advice you can give would be appreciatedBest RegardsByron Loader

[Anais GALLIGANI · Accepted solution]

Posted on August 29, 2014 at 17:38 Hello , For such kind of question, please get close to your ST sales or use Online support tool. Thanks a lot for your comprehension, Have a nice day, ST NFC RFID Dynamic tag support